First, experiments are conducted on three representative attribute vector dataset in the ZSL field, of which two small fine-grained data sets are Caltech-UCSD Birds200-2011(CUB) [1]} and Sun attribute Database(SUN) [2]}. A medium sized coarse-grained data set is Animals with Attribute 2 (AWA2) [3]}. Each data set has a human-defined common attribute library, which mainly contains attribute characteristics such as "color, wings, crawling, tail", etc. The defined attribute characteristics include both 0/1 type Boolean values and continuous vectors, as shown in Table REF . Detailed description of these data sets.
<TABLE>